/*
 * Copyright 2016 Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              John Scipione, jscipione@gmail.com
 */


#include "RainbowItem.h"

#include <math.h>

#include <ControlLook.h>
#include <GradientLinear.h>
#include <InterfaceDefs.h>
#include <View.h>


// golden ratio
#ifdef M_PHI
#       undef M_PHI
#endif
#define M_PHI 1.61803398874989484820


//      #pragma mark - RainbowItem


RainbowItem::RainbowItem(const char* string)
        :
        BStringItem(string, 0, false)
{
}


void
RainbowItem::DrawItem(BView* owner, BRect frame, bool complete)
{
        rgb_color highColor = owner->HighColor();
        rgb_color lowColor = owner->LowColor();

        if (IsSelected() || complete) {
                if (IsSelected()) {
                        owner->SetHighUIColor(B_LIST_SELECTED_BACKGROUND_COLOR);
                        owner->SetLowColor(owner->HighColor());
                } else
                        owner->SetHighColor(lowColor);

                owner->FillRect(frame);
        }

        float spacer = ceilf(be_control_look->DefaultItemSpacing() / 2);

        BRect colorRect(frame);
        colorRect.InsetBy(2.0f, 2.0f);
        colorRect.left += spacer;
        colorRect.right = colorRect.left + floorf(colorRect.Height() * M_PHI);

        // draw the rainbow
        BGradientLinear gradient;
        gradient.AddColor((rgb_color){ 255, 65,  54  }, 0);   // red
        gradient.AddColor((rgb_color){ 255, 133, 27  }, 60);  // orange
        gradient.AddColor((rgb_color){ 255, 220, 0   }, 102); // yellow
        gradient.AddColor((rgb_color){ 46,  204, 64  }, 153); // green
        gradient.AddColor((rgb_color){ 0,   116, 217 }, 195); // blue
        // indigo ;)
        gradient.AddColor((rgb_color){ 177, 13,  201 }, 255); // violet
        gradient.SetStart(colorRect.LeftTop());
        gradient.SetEnd(colorRect.RightBottom());
        owner->FillRect(colorRect, gradient);

        // draw the border
        owner->SetHighUIColor(B_CONTROL_BORDER_COLOR);
        owner->StrokeRect(colorRect);

        // draw the string
        owner->MovePenTo(colorRect.right + spacer, frame.top + BaselineOffset());

        if (!IsEnabled()) {
                rgb_color textColor = ui_color(B_LIST_ITEM_TEXT_COLOR);
                if (textColor.red + textColor.green + textColor.blue > 128 * 3)
                        owner->SetHighColor(tint_color(textColor, B_DARKEN_2_TINT));
                else
                        owner->SetHighColor(tint_color(textColor, B_LIGHTEN_2_TINT));
        } else {
                if (IsSelected())
                        owner->SetHighUIColor(B_LIST_SELECTED_ITEM_TEXT_COLOR);
                else
                        owner->SetHighUIColor(B_LIST_ITEM_TEXT_COLOR);
        }

        owner->DrawString(Text());

        owner->SetHighColor(highColor);
        owner->SetLowColor(lowColor);
}